[NFC] Tidy up test relying to Clang type serialization.

Author: varungandhi-apple

test/Sema/clang_types_in_ast.swift

@@ -3,12 +3,14 @@
 // RUN: %target-swift-frontend %s -typecheck -DNOCRASH1 -use-clang-function-types
 // RUN: %target-swift-frontend %s -typecheck -DNOCRASH2 -sdk %clang-importer-sdk
 // RUN: %target-swift-frontend %s -typecheck -DNOCRASH2 -sdk %clang-importer-sdk -use-clang-function-types
-// RUN: %target-swift-frontend %s -DAUXMODULE -module-name Foo -emit-module -o %t
 
 // rdar://problem/57644243 : We shouldn't crash if -use-clang-function-types is not enabled.
+// RUN: %target-swift-frontend %s -DAUXMODULE -module-name Foo -emit-module -o %t
 // RUN: %target-swift-frontend %s -typecheck -DNOCRASH3 -I %t
 
-// RUN: %target-swift-frontend %s -typecheck -DCRASH -I %t -use-clang-function-types
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend %s -DAUXMODULE -module-name Foo -emit-module -o %t -use-clang-function-types
+// RUN: %target-swift-frontend %s -typecheck -DNOCRASH3 -I %t -use-clang-function-types
 
 #if NOCRASH1
 public func my_signal() -> Optional<@convention(c) (Int32) -> Void> {
@@ -45,19 +47,3 @@ public func my_signal4() -> Optional<@convention(c) (Int32) -> Void> {
   return Foo.DUMMY_SIGNAL2
 }
 #endif
-
-#if CRASH
-import Foo
-public func my_signal1() -> Optional<@convention(c) (Int32) -> ()> {
-  return Foo.DUMMY_SIGNAL1
-}
-public func my_signal2() -> Optional<@convention(c) (Int32) -> Void> {
-  return Foo.DUMMY_SIGNAL1
-}
-public func my_signal3() -> Optional<@convention(c) (Int32) -> ()> {
-  return Foo.DUMMY_SIGNAL2
-}
-public func my_signal4() -> Optional<@convention(c) (Int32) -> Void> {
-  return Foo.DUMMY_SIGNAL2
-}
-#endif